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x in (-oo:+oo)
1/2-(4*x) = 9/8 // - 9/8
1/2-(4*x)-(9/8) = 0
1/2-4*x-9/8 = 0
-4*x-5/8 = 0 // + 5/8
-4*x = 5/8 // : -4
x = 5/8/(-4)
x = -5/32
x = -5/32
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